java简易计数器.doc

此文档收集于网络，如有侵权，请联系网站删除package my_calculator;public class Mainclass public static void main(String args) MyFrame mf=new MyFrame(Calculator);=package my_calculator;import java.awt.*;import java.awt.event.*;import java.math.*;public class MyFrame extends Frame Label lab;ButtonPanel bp;int flag;double result;boolean pt;boolean equal;public MyFrame(String arg0) throws HeadlessException super(arg0);Button bt=new Button(CE);pt=false;equal=true;result=0.0d;flag=0;lab=new Label(0,Label.RIGHT);bp=new ButtonPanel();setLayout(new BorderLayout();add(lab,BorderLayout.NORTH);add(bp,BorderLayout.CENTER);add(bt,BorderLayout.SOUTH);setLocation(200,200);setSize(300,300);setVisible(true);addWindowListener(new WindowAdapter()public void windowClosing(WindowEvent arg0) System.exit(0););bt.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) result=0.0d;lab.setText(0););bp.bt0.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(7);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(7).toString();elselab.setText(7););bp.bt1.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(8);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(8).toString();elselab.setText(8););bp.bt2.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(9);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(9).toString();elselab.setText(9););bp.bt3.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) flag=1;pt=false;result=Double.parseDouble(lab.getText();lab.setText(0););bp.bt4.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(4);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(4).toString();elselab.setText(4););bp.bt5.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(5);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(5).toString();elselab.setText(5););bp.bt6.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(6);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(6).toString();elselab.setText(6););bp.bt7.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) flag=2;pt=false;result=Double.parseDouble(lab.getText();lab.setText(0););bp.bt8.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(1);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(1).toString();elselab.setText(1););bp.bt9.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(2);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(2).toString();elselab.setText(2););bp.bt10.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(3);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(3).toString();elselab.setText(3););bp.bt11.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) flag=3;pt=false;result=Double.parseDouble(lab.getText();lab.setText(0););bp.bt12.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(equal=false)lab.setText(0);equal=true;else if(pt|Double.parseDouble(lab.getText()!=0)lab.setText(new StringBuilder(String.valueOf(lab.getText().append(0).toString();elselab.setText(0););bp.bt13.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(!pt)pt=true;lab.setText(new StringBuilder(String.valueOf(lab.getText().append(.).toString(););bp.bt15.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) flag=4;pt=false;result=Double.parseDouble(lab.getText();lab.setText(0););bp.bt14.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) if(flag=1)result=result/Double.parseDouble(lab.getText();lab.setText(new StringBuilder().append(result).toString();else if(flag=2)result*=Double.parseDouble(lab.getText();lab.setText(new StringBuilder().append(result).toString();else if(flag=3)result-=Double.parseDouble(lab.getText();lab.setText(new StringBuilder().append(result).toString();else if(flag=4)result+=Double.parseDouble(lab.getText();lab.setText(new StringBuilder().append(result).toString();equal=false;pt=false;)